CN2655414Y - Phase and amplitude discriminating electric leak relay - Google Patents

Abstract

The utility model relates to a phase and amplitude discriminating electric leakage relay which comprises a zero order mutual inductor, a voltage detecting circuit, an electric leakage signal amplifying circuit, an electric leakage simulation generating circuit, a power supply circuit, a relay and an AC contactor, wherein the zero order mutual inductor is connected with the electric leakage signal amplifying circuit. An SCM is arranged. The electric leakage signal amplifying circuit is connected with a 17 foot of the SCM, and the voltage detecting circuit is connected with an 18 foot of the SCM. A leakage current displaying circuit connected with the input end and the output end of the SCM is also arranged to form a return circuit. The utility model has the multiple functions of few peripheral circuits, electric leakage protection, under-voltage protection, leakage current numeric display, etc.

Description

The phase-detecting amplitude-detecting leak relay

One, technical field

The utility model relates to a kind of leakage relay, refers in particular to a kind of phase-detecting amplitude-detecting leak relay.

Two, background technology

Leakage relay commonly used at present is the JD series of products, and as JD1 type, JD3-40 type leakage relay and JD2 type neutral ground formula leakage relay etc., they have the electric shock creepage protection function.But the current value when they can't know the electric leakage action after electric leakage action, can't judge gets an electric shock occurs in A phase, B still C phase mutually.For this reason, Chinese patent once disclosed a kind of " phase-detecting amplitude-detecting leak relay " (ZL992292336, CN2392290Y, the day for announcing: on August 16th, 2000), it comprises that power circuit, input translation circuit, zero-sequence transformer link to each other with the electric leakage signal measuring circuit, signal synthesis circuit, time-delay output circuit, trip circuit and execution output circuit and contactor is characterized in that being connected with coincidence circuit of secondary trip and delay circuit and amplifying circuit between trip circuit and signal output apparatus.It has increased secondary trip and has once overlapped function, and has increased the noiseless circuit of economize on electricity, but peripheral circuit is more loaded down with trivial details.

Three, utility model content

The purpose of this utility model is to provide a kind of phase-detecting amplitude-detecting leak relay, and its peripheral circuit is few, and it is multi-functional with under-voltage protection, the demonstration of leakage current numeral etc. to have earth leakage protective.

For achieving the above object, the solution that the utility model is taked is: a kind of phase-detecting amplitude-detecting leak relay, comprise that circuit, power circuit, relay, A.C. contactor take place for zero-sequence transformer, voltage detecting circuit, electric leakage signal amplifying circuit, electric leakage simulation, zero-sequence transformer links to each other with the electric leakage signal amplifying circuit, a single-chip microcomputer is set, the electric leakage signal amplifying circuit connects 17 pin of single-chip microcomputer, voltage detecting circuit connects 18 pin of single-chip microcomputer, and the input and the output that also have a leakage current display circuit to connect single-chip microcomputer constitute a loop.

The utility model has been simplified peripheral circuit greatly owing to adopt single-chip microcomputer.Electric leakage signal becomes the signal that meets single-chip microcomputer input requirement after amplifying.Single-chip microcomputer detects electric leakage signal, calculates the amplitude I and the phase theta of electric leakage signal, and is calculated the leakage current of A, B, C three-phase by formula (1)～(3).Suppose to change for A mutually with B mutually, can calculate the electric leakage mutation current by formula (4), the phase place of mutation current is calculated by formula (5).During for other phase change, computing formula is similar with (5) to formula (4).Single-chip microcomputer is by realizing the phase-detecting amplitude-detecting leak protection according to detected leakage current amplitude and electric leakage mutation current.

Owing to adopted single-chip microcomputer, the leakage current of leakage current and A, B, C three-phase can be outputed to show circuit, be convenient to the user and carry out accident analysis.Simultaneously, after the electric leakage action, can also demonstrate gradual electric leakage action or sudden change electric leakage action, when sudden change electric leakage action, can also demonstrate the sudden change electric leakage and occur in A phase, or B phase, or the C phase.

$I_{\mathrm{\&Delta;r}}=\sqrt{I_{\mathrm{\&Delta;<figure-callout\; id="2"\; label="a"\; filenames="Y20032010089800081.png"\; state="\{\{state\}\}">a</figure-callout>}}^2+I_{\mathrm{\&Delta;b}}^2-I_{\mathrm{\&Delta;a}}{I}_{\mathrm{\&Delta;b}}}--\left(4\right)$

${\mathrm{\&theta;}}_{\mathrm{\&Delta;}}=\mathrm{acrtg}\frac{\sqrt{3}{I}_{\mathrm{\&Delta;b}}/2}{I_{\mathrm{\&Delta;a}}-I_{\mathrm{\&Delta;b}}/2}--\left(5\right)$

Adopt the phase-detecting amplitude-detecting leak testing circuit under the Single-chip Controlling, output is finished by relay, can be used in combination with A.C. contactor, and A.C. contactor is an energy-saving run.Analog phase-detecting amplitude-detecting leak relay before its function not only can replace fully, and on function, increased the leakage current demonstration, electric leakage manner of execution (gradual electric leakage action, sudden change electric leakage action) shows, sets intelligent functions such as selecting residual operating current automatically.Adopt the technical grade singlechip chip, not only ensured the properties of product advanced person, also ensured the reliability of work.

The utility model compared with prior art has following characteristics:

1, the leakage current numeral shows.Adopt charactron to show leakage current, not only can show three-phase leakage current vector and, can also show respectively the leakage current of A, B, C three-phase is having breakthrough aspect the electric leakage demonstration.

2, the electric leakage manner of execution shows.Current value when general leakage relay can't be known the electric leakage action after the electric leakage action, leakage current value when this leakage relay not only can show the electric leakage action, can also judge that it still is the C phase mutually that electric shock occurs in A phase, B, has shortened the time of user's accident analysis and eliminating greatly.

3, the earth leakage protective characteristic is adjustable.The specified leakage current of gradual action is 300mA, 500mA, 1000mA etc., and the specified leakage current of abrupt change is 30mA, 50mA etc.Can also set automatic operational mode, promptly select suitable electric leakage operating value according to the size of grid power leakage electric current automatically, satisfy the needs of user under different occasions, improve operational percentage greatly.

4, alternating-current contactor energy-saving operation reduces electric quantity consumption.Active output has been adopted in leakage relay output, and the A.C. contactor of control is for exchanging adhesive, and direct current keeps, and greatly reduces energy consumption, has reduced user's operating cost.

5, function is many, and is user-friendly.This leakage relay not only has creepage protection function, and also the tool electric leakage shows, leakage current moves functions such as demonstration, under-voltage protection.

Four, description of drawings

Fig. 1 is the circuit block diagram of present embodiment.

Fig. 2 is the circuit theory diagrams of present embodiment.

Five, embodiment

Below in conjunction with embodiment and accompanying drawing thereof the good effect of the utility model and generation thereof is remake description.

Referring to Fig. 1 and Fig. 2, a kind of phase-detecting amplitude-detecting leak relay, comprise that circuit, power circuit, relay J 1 and J2, A.C. contactor take place for zero-sequence transformer LH, voltage detecting circuit, electric leakage signal amplifying circuit, electric leakage simulation, zero-sequence transformer LH links to each other with the electric leakage signal amplifying circuit, a single-chip microprocessor MCU is set, the electric leakage signal amplifying circuit connects 17 pin of single-chip microprocessor MCU, voltage detecting circuit connects 18 pin of single-chip microprocessor MCU, and the input and the output that also have a leakage current display circuit to connect single-chip microprocessor MCU constitute a loop.

Referring to Fig. 2, transformer B1, diode D1, D2 and integrated voltage-stabiliser tube T1 and capacitor C 1～C4 constitute described power circuit, and diode D1, D2 rectification go out and directly give relay J 1 and J2 power supply through the voltage of integrated voltage-stabiliser tube T1 voltage stabilizing.

Referring to Fig. 2, what another secondary of transformer B1 and diode D16～D21, resistance R 50 constituted A.C. contactors exchanges adhesive, direct current holding circuit.Reach the energy-saving run of A.C. contactor like this.

Referring to Fig. 2,13 pin of single-chip microprocessor MCU are connected with the base stage of triode T2, and triode T2, relay J 1 and J2, resistance R 42, capacitor C 17, resistance R 45, triode T1 constitute the divide-shut brake control circuit.Single-chip microprocessor MCU realizes the control to relay J 1 and J2 by to the control of triode T2, thereby finishes the closing of A.C. contactor, sub-switching operation.The circuit that resistance R 42, capacitor C 17, resistance R 45, triode T1, relay J 2 constitute is finished the interchange adhesive to A.C. contactor.

Referring to Fig. 2, zero-sequence transformer LH has two secondary, and secondary and button SW1～SW4 and resistance R 9～R13 constitute described electric leakage simulation circuit takes place.SW1 presses when button, and display led 1 shows " a ", and SW2 presses when button, LED1 shows " b ", and SW3 presses when button, and LED1 shows " c ", SW4 presses when button, and LED1 shows " e " or numeral (showing that " e " expression surpasses range, shows the numeral leakage current).Another secondary of zero-sequence transformer LH is sent into detected electric leakage signal by resistance R 15～R21, capacitor C 5～C7 and operational amplifier U1D and is constituted described electric leakage signal amplifying circuit.Realization is sent into single-chip microprocessor MCU then to the amplification of electric leakage signal, by the processing of single-chip microprocessor MCU realization to electric leakage signal.

Referring to Fig. 2, resistance R 1～R8, diode D3～D8 and operational amplifier U1A～U1C constitute described voltage detecting circuit.When three-phase electricity be pressed with～phase (or two-phase or three-phase) is when voltage is lower than set point, single-chip microprocessor MCU is sent the instruction of threading off, make relay J 1 electric, relay J 1 action makes the disjunction of A.C. contactor dead electricity.Single-chip microprocessor MCU can be according to the electric leakage signal that detects simultaneously, and also may command A.C. contactor disjunction realizes earth leakage protective function.

Referring to Fig. 2, resistance R 22～R28, display led 1 and triode T3～T5 constitute described leakage current display circuit.This circuit is directly driven by single-chip microprocessor MCU, and single-chip microprocessor MCU is exported demonstration according to leakage current, situation such as under-voltage.

Referring to Fig. 2, single-chip microprocessor MCU adopts the 167C711 single-chip microcomputer.

Claims (8)

1, a kind of phase-detecting amplitude-detecting leak relay, comprise that circuit, power circuit, relay J 1 and J2, A.C. contactor take place for zero-sequence transformer LH, voltage detecting circuit, electric leakage signal amplifying circuit, electric leakage simulation, zero-sequence transformer LH links to each other with the electric leakage signal amplifying circuit, it is characterized in that: a single-chip microprocessor MCU is set, the electric leakage signal amplifying circuit connects 17 pin of single-chip microprocessor MCU, voltage detecting circuit connects 18 pin of single-chip microprocessor MCU, and the input and the output that also have a leakage current display circuit to connect single-chip microprocessor MCU constitute a loop.

2, a kind of phase-detecting amplitude-detecting leak relay according to claim 1, it is characterized in that: transformer B1, diode D1, D2 and integrated voltage-stabiliser tube T1 and capacitor C 1～C4 constitute described power circuit, and diode D1, D2 rectification go out and directly give relay J 1 and J2 power supply through the voltage of integrated voltage-stabiliser tube T1 voltage stabilizing.

3, a kind of phase-detecting amplitude-detecting leak relay according to claim 1 and 2 is characterized in that: what another secondary of transformer B1 and diode D16～D21, resistance R 50 constituted A.C. contactors exchanges adhesive, direct current holding circuit.

4, a kind of phase-detecting amplitude-detecting leak relay according to claim 1, it is characterized in that: 13 pin of described single-chip microprocessor MCU are connected with the base stage of triode T2, and triode T2, relay J 1 and J2, resistance R 42, capacitor C 17, resistance R 45, triode T1 constitute the divide-shut brake control circuit.

5, a kind of phase-detecting amplitude-detecting leak relay according to claim 1, it is characterized in that: described zero-sequence transformer LH has two secondary, and secondary and button SW1～SW4 and resistance R 9～R13 constitute described electric leakage simulation circuit take place,

6, a kind of according to claim 1 or 5 phase-detecting amplitude-detecting leak relay is characterized in that: another secondary of zero-sequence transformer LH is sent into detected electric leakage signal by resistance R 15～R21, capacitor C 5～C7 and operational amplifier U1D and is constituted described electric leakage signal amplifying circuit.

7, a kind of phase-detecting amplitude-detecting leak relay according to claim 1, it is characterized in that: resistance R 1～R8, diode D3～D8 and operational amplifier U1A～U1C constitute described voltage detecting circuit.

8, a kind of phase-detecting amplitude-detecting leak relay according to claim 1, it is characterized in that: resistance R 22～R28, display led 1 and triode T3～T5 constitute described leakage current display circuit.

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